Just a few days after a pre-production M3 was shown flaunting its rear-end, another upcoming BMW model has leaked from the production line. This time, a photo posted by Instagram page wilcoblok allegedly shows the front of the new BMW 4 Series, confirming fears that it will feature a massive kidney grille previewed by the Concept 4.

The photo isn't the best quality, but we can clearly see the grille has been stretched to fill nearly the full height of the front and features horizontally arranged struts in contrast to the current model's vertical ones.

This also means the new M3 and M4 will get an extended front grille. The large air intakes also suggest we're looking at the hotter M440i or possibly the M4.

While this radical design change gives the new 4 Series, M3, and M4 a bolder look at the front, it's bound to be controversial. However, BMW recently defended the radical design change, arguing that the automaker needs to take risks and evolve the styling to stand out from the competition. The radical styling will also help better differentiate the 4 Series Coupe from the 3 Series.

Under the hood, the new BMW 4 Series will share the same engine as the 3 Series. This means we can expect the 430i to be powered by a 2.0-liter turbocharged four-cylinder producing 255 horsepower and the M440i to use a 3.0-liter turbocharged inline-six with 380 hp. A new M4 will also join the lineup.

Reports suggest the new M3 and M4 extract 473 hp from a 3.0-liter twin-turbo inline-six, which will be sent exclusively to the rear wheels in the base model. The range-topping Competition models, on the other hand, will allegedly increase the output to 503 hp and feature an all-wheel-drive system that can be switched to rear-wheel drive on the fly like in the M5.